Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 12, Issue -, Pages 1065-1079Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2021.03.023
Keywords
Lean Duplex stainless steel; Dynamic recovery; Phase transformation; Crystallographic texture; Strain hardening behavior
Funding
- Instituto Federal do Espirito Santo
- FAPES [42/2018, 01.01.0001]
- Brazilian National Nanotechnology Laboratory (LNNano), CNPEM/MCTI, Campinas, Brazil [STC-22766, SEM e 23493]
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The microstructure, crystallographic texture, and strain hardening behavior of UNS S32304 duplex stainless steel were studied in hot tensile tests. Different grain orientations and strain hardening behaviors were observed in the ferrite and austenite phases during the hot tensile process.
Duplex stainless steels can be used for applications in the nuclear industry endorsing its choice as an external shield for Type B packages. The microstructure, crystallographic texture, and the strain hardening behavior of UNS S32304 duplex stainless steel was investigated in hot tensile tests by Electron Backscattering Diffraction technique. Interrupted hot tensile tests with strain rates (epsilon) over dot = 10(-2) s(-1) and (epsilon) over dot = 10(-1) s(-1) were carried out at 700 degrees C using a Thermomechanical Physical simulator. The alpha parameter of gamma distribution was associated for the first time with strain in ferrite and austenite phases through the Grain Orientation Spread parameter (GOS). The ferrite phase did not show the dynamic equilibrium between the stored energy and recovery rates. The average GOS in the ferrite phase was larger for (epsilon) over dot = 10(-1) s(-1) due to a smaller time available for dislocation annihilation and rearrangement in dynamic recovery. The grain rotation sequence < 100 > -> < 100 > - < 101 > -> < 101 > was found in ferrite phase. In the austenite phase, the dynamic recrystallization was not observed and the < 111 > and < 100 > fiber textures parallel to the tensile direction were strengthened. The austenite -> ferrite phase transformation occurred during the hot tensile tests and showed the Kurdjumov-Sachs orientation relationship. The modified Crussard-Jaoul analysis showed six-strain hardening stages which were associated with the average GOS and austenite -> ferrite phase transformation. (c) 2021 The Authors. Published by Elsevier B.V.
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